斜坑巻索の劣化の進行とその電磁探傷記録について

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書誌事項

タイトル別名
  • Deterioration of Haulage Rope in Inclined Shaft and the Electromagnetic Inspection Chart
  • シャコウカン サク ノ レッカ ノ シンコウ ト ソノ デンジ タンショウ キ

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抄録

Expected and unexpected distributions of defect along the rope length were observed on the electromagnetic inspection chart for several inclined shaft winding ropes, resulting in the discussion about dispersion or concentration of defect settled after the upside-down re-installation, the defect derived from tandem deflection sheaves, and the defect in multilayer rope in which a particular layer tends to be coiled up irregularly on the drum; each of those appeared on the chart.<BR>chart. The amplitude of the background, noise train on the electromagnetic inspection chart had been assumed to be related to the degree of deterioration of the rope, since it represents the magnitude and density of a series of minute imprints on wires as an accumulated effect of bending or change of tension through the time of service, and this was subsequently verified by breaking tests with a number of rope specimens, which were of different noise levels on the chart obtained prior to the breaking test.<BR>The relation confirmed after the breaking test is in an exponential one between the remaining rope strength and the background noise level at the point of attention, if the actual portion where the breakage of wire occurs is not included. The loss of strength resulting from the breakage of wire, which can also be calculated from the height of the impulse on the chart, is then added in order to determine the remaining rope strength.<BR>This relation, which may be called a deterioration index, is so clear and characteristic for each winding system that the remaining strength as well as the rope renewal time can be reasonably predicted with rigid security retained, by studying this index together with the increment of the background noise level on the successive records of the electromagnetic inspection.

収録刊行物

  • 日本鑛業會誌

    日本鑛業會誌 95 (1093), 143-148, 1979

    一般社団法人 資源・素材学会

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